Answer:
B and C
Explanation:
B. In a given rock sample, the amount of Silicon-32 isotopes gets divided in half about every 170yrs.
This is the concept of half-life. Half life is the time take for half of a radioactive isotope to disintegrate. The shorter the half life the faster the isotope disintegrates.
From the question, we were told that it would take 170yrs for half of the isotope of Silicon to disintegrate to Phosphorus. This is the half life.
C. The half life can be used to determine the amount of Si-32 that has decayed from the time closure temperature was reached.
The closure temperature is very important in radioactivity. It is the temperature at which a system has cooled and there is no resulting disintegration of parent and daughter isotopes.
From first order kinetics, we know that the rate at which radioactive elements decay at any time is directly proportional to the number of radioactive atoms present. A knowledge of the half life helps to figure out the number of atoms that has decayed in time.
You realy need to put the anwser optns cause its inpssible to anwser
Physically, we would feel very less gravity, so we can travel, by our own body force, we would feel very less weight on our body.
Emotionally, it would be my best moment.... i'll just forget about countries on the Earth & think like a citizen (Human) on Earth
Hope this helps!
Answer:
Why are cocoa beans fermented?
Explanation:
Cocoa beans are fermented so as to destroy the seed coat, kill the germ and give the cocoa a good taste.
Answer:
1) Las montañas ubicadas en las coordenadas 28º N 86º E son las de la cordillera del Himalaya, dado que dichas coordenadas se corresponden con la región de Nyalam, en el Tíbet, dentro de la República Popular China y muy cerca de la frontera con Nepal. Es una zona de elevada altitud (se ubica a casi 4,000 metros sobre el nivel del mar), en plena cordillera de los Himalayas.
2) Las montañas ubicadas en las coordenadas 32ºS 70ºO son las de la cordillera de los Andes en América del Sur, dado que las coordenadas brindadas pertenecen a Calingasta, en la Provincia de San Juan, Argentina, región cuyo pico máximo de altitud supera los 6,000 metros sobre el nivel del mar.
